Assuming that they can receive and send their money quickly and conveniently with ecash, I speculate that they will never care about the difference between centralized and decentralized.
Would this not hurt bitcoin as a currency? Would this not only encourage bitcoin to be used as a speculative investment? How about mainstream adoption?
Most people in my country that I know don't care about the difference between centralized and decentralized as long as their payment mode is quick and reliable.
Bitcoin has a lot of difference in e-cash, and I think this wouldn't hurt bitcoin. People still adopt it because they will see many opportunities to earn, not like e-cash that only use for transactions only.